摘要
A comprehensive investigation was performed for repairing the different types of cracks appearing on the surface or inside the concrete lining at various depths.The mate- rial properties used in grouting and two methods for crack repair were discussed in details, and consequently reliable repair measures were proposed and implemented.It is a better choice to adopt the hole-drilling method for the relatively regular crack.The grouting pres- sure should not be too high and it is generally between 0.4~0.6 MPa.For the second time grouting,the pressure maybe increased to 0.8 MPa.Other method is the pasting nozzles method which is more suitable for irregular cracks such as cracks with intensive density and crossing cracks.Its grouting pressure is generally between 0.6~1.0 MPa.The in-situ tests in Three Gorges Project demonstrate favorably the feasibility and applicability of the proposed methods for crack repair within the lining concrete.
A comprehensive investigation was performed for repairing the different types of cracks appearing on the surface or inside the concrete lining at various depths. The material properties used in grouting and two methods for crack repair were discussed in details, and consequently reliable repair measures were proposed and implemented. It is a better choice to adopt the hole-drilling method for the relatively regular crack. The grouting pressure should not be too high and it is generally between 0.4-0.6 MPa. For the second time grouting, the pressure maybe increased to 0.8 MPa. Other method is the pasting nozzles method which is more suitable for irregular cracks such as cracks with intensive density and crossing cracks. Its grouting pressure is generally between 0.6-1.0 MPa. The in-situ tests in Three Gorges Project demonstrate favorably the feasibility and applicability of the proposed methods for crack repair within the lining concrete.
基金
the National Natural Science Foundation of China(10602049)
关键词
热裂纹
三峡地区
开采技术
船闸
thermal cracks, lining concrete, Three Gorges Project permanent ship locks